Prefilter bandwidth effects in asynchronous sequential symbol synchronizers based on pulse comparison by hybrid transitions at half bit rate

This work studies the prefilter bandwidth effects in four asynchronous sequential symbol synchronizers. We consider three prefilter bandwidths namely B1=∞, B2=2.tx and B3=1.tx, where tx is the bit rate. The synchronizer has two variants one asynchronous by both transitions at bit rate and other asynchronous by hybrid (both and positive) transitions at half bit rate. Each variant has two versions namely the manual and the automatic. The objective is to study the prefilter with the four synchronizers and to evaluate their output jitter UIRMS (Unit Interval Root Mean Square) versus input SNR (Signal Noise Ratio). A new approach is presented using a prototype operating by hybrid transitions.